For the designs, Photoshop or another imaging application should get you better results.
Ensure that the designs are about 50% larger than the final delivery rez. This will allow you to move the objects about in z-space without any of their edges getting cutoff.
Place your layers in AE make them 3D layers and then spread them out in z-space.
For movement, try the following Expressions –
1) Expression for position –
// Start Expression
MoveIt = wiggle(.5,25);
[value[0], MoveIt[1],value[2]]
//End Expression
The Expression will provide an organic movement along the y-axis (ie up and down movements). Apply the Expression to each layer and RAM Preview. Make adjustments to the wiggle values to suit your taste.
You may also want to apply an organic element to the z-rotation values. Use the following Expression –
wiggle(.5,5)
HTH
RoRK
Intensive AE & Mocha Training in Singapore and Malaysia
Adobe ACE/ACI (version 7) & Imagineer Systems Inc Approved Mocha Trainer